Gird reference is SE264196, and that's the simple bit- basically head to the end of low road Dewsbry and this is one where you can quite literally follow your nose!!
The sewage works is a private working site, with no agreed public access or rights of way. As I understand it (and this is from heresay and anecdote) the owners are considerate to birders and will let them onto the site. There is a hide and there are about four parking places that can be used by visitors to the site. That is part of the problem, once these are full then there is nowhere else to park other than getting in the way of workers which is totally unacceptable. Additionally there are strict opening and closing times and you will juust be locked in if you remian outside of these times.
Having said that again I am led to belive that birders eye's are appreciated on what is an open site with many comings and goings. It is also quite easy to bird without getting in anyones way, and as a site is very interesting, and at only 15 minutes from my house a new site that I will visit again. There are about 8 lagoons with different levels of water on, and this will be on my list for Jack Snipe and Water Pipit in winter for sure. it can be done in half an hour, but there is enough to keep someone bsy for half a day too!
So my assumption wold be that limited numbers (less than 10 certainly) of considerate birders would be ok. John, the guy who birds it every day, limits the info that comes out to ensure access remains, and I can't blame him. There are no facilities to cope with a flood of birders, and it may jeopardise the future release of news from the site too.
So in summmary. This is a private site, with no public access where current owners turn a blind eye to a small number of local birders who visit in a considerate manner. Maybe someone who knows more will clarify the exact position in due course.